Console error when typing a velocity macro in source mode

Steps to reproduce:

• Create an empty document
• switch to source mode
• type

  {{velocity}}

• hit enter to create a new line

The following error appears in the console:

typeError: g.getSelection(...) is null[Learn More]

See the screenshot for the fullstack.

I didn't checked if it impacts the WYSIWYG when switching back in view mode.